当您选择按钮时，它就引发操作以更新进度条。
When you select the button, it triggers the action to update the progress bar.
在文件上载期间，会显示并更新进度条(参见图2)。
During file upload, the progress bar is displayed and updated (see Figure 2).
在文件上载期间，会显示并更新进度条(参见图2)。
During file upload, the progress bar is displayed and updated (see Figure 2).
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